Hi, I've just started pat testing and I'm waiting to go on a training course. I've been shown how to pat test several class 1 and class 2 items from a colleague at work, but when I ask him to show me how to pat test mobile phone, laptop chargers and cordless tool chargers he tells me you only do a visual on them. This can't be right surely? Any help on this would be appreciated.

Where are you going to be testing items? In Aus & NZ , under AS/NZS 3760:2010 - items with detachable leads under our T&T Standard have their lead tested as a lead, then lead plus associated power supply tested as an appliance of the appropriate Class.

I know this is an old thread but a quick question on class 1 power adapters?

After a discussion with a fellow PAT tester in another building - If you do get a viable earth reading at the "DC" end, even if it's close to the pass/fail limit, do you then plug the adapter into the unit it's supplying and continue the test on that item? which 95% of the time will fail because of the presence of the adapter, one of us said yes the other said just do a visual. If it helps the item that caused the discussion, was a sound desk with a 5pin DMX.

I have a vague memory from the pat testing course , some chargers/psu's which theoretically class one or just not marked as class 2 have the earth wire connected to a metal can surrounding the transformer coils to help with shielding from interference?